Dipper tooth assembly



May 17 1950 E. G. oPsAHL 2,936,538

DIPPER TOOTH ASSEMBLY Filed Deo. l5. 1954 nited States Patent O DIPPER TOOTH ASSEMBLY Steel Foundries, Chicago, lll., a corporation of New Jersey Application DecemberlS, 1954, Serial No. 475,417 Y 3 Claims. (Cl. 37142) Because the necessity for frequent replacement of dipt.

per teeth points requires that the machines be temporarily kept out of service, a system facilitating the rapid change of points is highly desirable.

Therefore, a primary object of this invention is to provide a simple, readily detachable, resilient retaining means for dipper teeth assemblies.

Eugene G. Opsahl, Chicago, Ill., assignor to American Another object of the invention is the provision of means to retain a dipper tooth point to a base or shank that may be employed without the use of extensive equipment.

A more specific object of the invention is the provision of a dipper tooth assembly retaining means comprising a resilient metal clip receivable in coaxially aligned apertures of the telescoped members.

These and other objects of the invention will become apparent from a reading of the description and an examination of the drawings, wherein:

Figure 1 is a plan view of a two-piece dipper tooth assembly embodying the invention; and

Figure 2 is a sectional view taken along the line 2-2 of Figure l.

To describe the invention, referring to the drawings, it will be apparent that th'e dipper tooth assembly comprises a base member designated generally at 4, and a point member designated generally at 6 retained in telescopic relation to the base by a clip 8.

The base 4 comprises upper and lower spaced elements 10 and 12 merged at their forward ends to define a forwardly extending wedge shaped nose 14 having upper and lower surfaces 15 and 17. The central sections of elements 10 and 12 are connected by a vertical web 16 having, extending rearwardly therefrom, a shank 18 dening an aperture 20 therein for use in securing the shank to an associated bucket or dipper (not shown). The spaced elements, nose, web, and shank of the base are preferably cast as a unit with the longitudinal axis of the nose angularly related to the longitudinal axis of the shank. The upper and lower surfaces of the nose are set in from the outer upper and lower surfaces of the spaced elements to provide shoulders 22 and 24. The nose 14 is provided intermediate its ends with a preferably vertical aperture 26 extending therethrough.

The point 6 may be bifurcated at one end thereof, the rear end, forming a jaw having upper and lower arms 28 and 30, defining a wedge shaped aperture 32 therebetween, and having in their respective ends coaxially aligned vertical apertures 34 and 36.

The spaced elements 10, 12 of the base and the rear portion or wall portion 28 of the point may be substantially rectangular in shape, as seen in plan view (Figure "ice 2 1), the forward portion 46 of the point 6 being tapered and relatively tlat.

The clip 8 may comprise a rectangular metal strip having its central section 40 bowed convexly forward and its ends 42 and 44 bowed convexly rearward to provide two contact points with the point and one with the nose.

To assemble the device, the nose 14 of the base is inserted into the aperture 32 with the upper and lower sides 15 and 17 of the nose abutting the corresponding surfaces 19 and 21 of the aperture 32, and the rear wall 35 of aperture 26 in coaxial alignment with the rear walls 39 and 41 of apertures 34 and 36. The forward wall 38 of nose aperture 26 may be set in from the forward walls 31 and 33 of the arm apertures 34 and 36 and formed concavely to receive the retaining clip 8.

The concave formation of the front wall 38 in coopera-` tion with the central section 40 of the clip insures its retention in the aperture in the event of severe impacts at the ends of the clips during normal operations. rovision of adequate clearances at the points of contact between the shoulders and the arms and between the forward point of the nose and the apex of the angle formed by the inner surfaces of the arms may be pio` vided to reduce the shear stress to which the unit is subjected.

The clip is then inserted into the aperture 34 of the arm 28 with the bowed center section of the clip facing forward to abut the' forward wall 3S of the aperture of the nose. It is then forced through the apertures of the nose and lower arm until it is seated in locked position With its ends 42 and 44 abutting and offering pressure in a rearward direction against the rear walls 39 and 41 of the arm apertures 34 and 26, and its center portion 40 abutting and offering pressure in a forward direction against the forward wall 38 of the nose. Thus the point is rmly but resiliently secured to the base.

To replace the point, the clip is merely forced out of the apertures, a new point inserted over the nose of the base, and the clip is forced back into position thus securing the new point to the base.

I claim:

l. In a dipper tooth assembly, a base having a nose protruding forwardly therefrom, said nose having a vertical slot extending therethrough, a point having spaced arms extending rearwardly therefrom and delining an aperture therebetween, said arms having coaxially aligned vertical slots extending therethrough, a front and a rear wall delined by each of the slots, the nose of said base being receivable within the aperture defined by the arms of said point whereby the rear walls of all of the slots are in vertical alignment and the front wall of the nose slot is set in from the front walls of the slots of the respective arms and is formed concavely, and means to retain said base and said point in tight telescopic engagement, said means comprising a resilient elongated metal bar having ends formed convexly in'one direction and a central section formed convexly in an opposite direction, said bar being of uniformly flexible material whereby both end portions can be exed transversely relative to the central section and having inclined surfaces so that a camming effect thereon can be produced in response to longitudinal movement relative thereto, :said bar being receivable in the slots of said arms and said nose and so disposed therein that the ends of the bar bear against the rear walls of the respective arm slots and the central section of the bar is received in and bears against the concave front wall of the nose slot.

22. A dipper tooth comprising: a base member having a forwardly projecting nose defined by opposed spaced side surfaces and opposed spaced upper and lower surfaces; a removable point having opposed spaced side walls and opposed spaced upper and lower walls complernental to the surfaces of said nose; an aperture eX- tended through said nose substantially at the longitudinal center line of the base member; spaced apertures formed in opposed Walls of said pointrsubstantially at the longitudinal center line thereof and in substantial register with the open ends of said aperture in said nose, each of said apertures having a front Wall and a rear Wall; a space within said aperture in said nose for receiving a convex central portion of a resilient metal clip when the point is mounted on the base member; and a symmetrical resilient metal clip extending through and reposed wlthin said apertures, said metal clip having a convex central portion received within said space and having portions thereof bearing against and being under compression between the rear wallsof the apertures in said point and the forward wall of the aperture in saidy nose, to thereby releasably secure said point on the base member.

3. A dipper tooth comprising: one member having a forwardly projecting portion; another member having spaced portions defining therebetween a cavity having a contour generally complemental to the contour of the portion of said one member; an aperture extending through the portion of said one member substantially at the longitudinal center line of said one member; spaced apertures formed in the portions of said other member substantially at the longitudinal center line thereof and in substantial register with the open ends of the aperture in the portion of said one member, each of said apertures having a front wall and a rear wall; a space within the aperture of the portion of said one member for receiving a protruding central portion of a resilient metal clip when said other member is mounted on said one member; and a symmetrical resilient metal clip extending through and reposed within said apertures, said metal clip having a protruding central portion received within said space land having portions thereof bearing against and being under compression between the rear walls of the apertures in said other member and the forward wall in the aperture of the portion of said one member,

' to thereby releasably secure said other member on said one member.

References Cited in the file of this patent UNITED STATES PATENTS 

